I am trying to figure out the actual percentage chance that Vex will be a reward from Atheon based off of gathered user data. For me, it took exactly 10 runs of the hardmode to get Vex which makes it about a 1 in 10 chance to drop. How many runs did it take you to get it?
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I have two...i got one on my hunter on the first run through the hard raid, and one on my titan on his first hard raid(along with helmet and timebreaker). Just luck